🐛 Clamp static evaluation within +- checkmate limits

[eduherminio]

This avoids engine crashes for positions such as:
QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QPPPPPPP/K6k b - - 0 1
and engine crashes such as
https://lichess.org/49dBqSDK

position fen QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QPPPPPPP/K6k b - - 0 1 moves h1g1
go depth 50
info depth 1 seldepth 1 multipv 1 score mate 138 nodes 1 nps 1 time 20 pv
info depth 1 seldepth 1 multipv 1 score mate 138 nodes 1 nps 1 time 27 hashfull 0 pv
bestmove a8a8

Non-regression tests:

8+0.08 👍🏽

Score of Lynx-bugfix-staticeval-out-of-range-1977-win-x64 vs Lynx 1.0.0: 2105 - 2033 - 2741  [0.505] 6879
...      Lynx-bugfix-staticeval-out-of-range-1977-win-x64 playing White: 1415 - 666 - 1359  [0.609] 3440
...      Lynx-bugfix-staticeval-out-of-range-1977-win-x64 playing Black: 690 - 1367 - 1382  [0.402] 3439
...      White vs Black: 2782 - 1356 - 2741  [0.604] 6879
Elo difference: 3.6 +/- 6.4, LOS: 86.8 %, DrawRatio: 39.8 %
SPRT: llr 2.91 (100.6%), lbound -2.25, ubound 2.89 - H1 was accepted

40+0.4, had to cancel

Score of Lynx-bugfix-staticeval-out-of-range-1977-win-x64 vs Lynx 1.0.0: 2105 - 2033 - 2741  [0.505] 6879
...      Lynx-bugfix-staticeval-out-of-range-1977-win-x64 playing White: 1415 - 666 - 1359  [0.609] 3440
...      Lynx-bugfix-staticeval-out-of-range-1977-win-x64 playing Black: 690 - 1367 - 1382  [0.402] 3439
...      White vs Black: 2782 - 1356 - 2741  [0.604] 6879
Elo difference: 3.6 +/- 6.4, LOS: 86.8 %, DrawRatio: 39.8 %
SPRT: llr 2.91 (100.6%), lbound -2.25, ubound 2.89 - H1 was accepted